tranexamic acid 、
1-({[(2,5-Dioxopyrrolidin-1-yl)oxy]carbonyl}oxy)butyl propanoate 以
MTBE acetone water 为溶剂,
以to yield the title compound 34 (144 mg, 18% yield) as a brittle off-white solid的产率得到trans-4-{[1-(propanoyloxy)butoxycarbonyl]aminomethyl}-cyclohexanecarboxylic acid